octane rating qs

quackmandude · 07-21-2009, 09:28 AM

im from south texas, i went up to new mexico last week and the octane ratings at the pumps were diff. i was ina rental so i didnt care. but this winter i wanna take my sl to the mountains for some good drining. supreme here is 93 octane, but over there its only 90, could it be because the altitude??? will my car be ok with 90 octane??
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VR43000GT · 07-21-2009, 12:55 PM

If you are in really high altitude your car will run just fine on 91 octane as there will be significant changes in altitude and thus thinner air causing less compression. If you go to Colorado up in the mountains they sell 85 octane as their standard grade gasoline.

quackmandude · 07-21-2009, 03:47 PM

yea it was about 9k above sea level
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AutostradaVR4 · 07-21-2009, 05:43 PM

an SL will be fine with 91 octane anyway. Only the turbos need 93.

jason_bet · 07-21-2009, 06:15 PM

Here in Utah we only have 91..

Stealthee · 07-21-2009, 07:03 PM

Quote:

Originally Posted by AutostradaVR4

an SL will be fine with 91 octane anyway. Only the turbos need 93.

Again that is untrue. In a lot of places the highest you can get is 91. The owners manual even says run at least 91. It doesnt say 91 for non turbos and 93 for turbos.

Polygon · 07-21-2009, 11:39 PM

Quote:

Originally Posted by jason_bet

Here in Utah we only have 91..

Yep, we can't get 93 here and my TT has never complained about it.

AutostradaVR4 · 07-21-2009, 11:56 PM

when i was in OK City for training all they had was 91 and it made my car run like garbage and smell terrible. Tried different brands but didnt do any good. After the first few fillups it eventually started running smoothly, but still felt sluggish like it was down on power and still smelled. Maybe the ECU has to learn what fuel your running or something?

quackmandude · 07-22-2009, 02:32 AM

they had 91, but the reasoneis that the airs thinner, so they needa compensate for the i guess. so it will burn right
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Stealthee · 07-22-2009, 08:38 AM

Quote:

Originally Posted by AutostradaVR4

when i was in OK City for training all they had was 91 and it made my car run like garbage and smell terrible. Tried different brands but didnt do any good. After the first few fillups it eventually started running smoothly, but still felt sluggish like it was down on power and still smelled. Maybe the ECU has to learn what fuel your running or something?

I think it was in your head.

The air is thinner, ie less oxygen, so less oxygen means less fuel needed.

91STT · 07-22-2009, 10:59 AM

Quote:

Originally Posted by AutostradaVR4

when i was in OK City for training all they had was 91 and it made my car run like garbage and smell terrible. Tried different brands but didnt do any good. After the first few fillups it eventually started running smoothly, but still felt sluggish like it was down on power and still smelled. Maybe the ECU has to learn what fuel your running or something?

Quote:

Originally Posted by Stealthee

I think it was in your head.

The air is thinner, ie less oxygen, so less oxygen means less fuel needed.

Probably the altitude had something to do with it and the ECU had to readjust the trims to account for the changes too.

quackmandude · 07-22-2009, 11:19 AM

no the cars shouldrun just fine at higher altitudes with the slightly lower octane rating. i just wanted to make sure cuz i dont wanna be stuck in a part of thecountry with shit gas. i saw a vr4 up there hauling ass, his car seemed fine, lol. and another stealth parked.
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Stealthee · 07-22-2009, 11:36 AM

Quote:

Originally Posted by quackmandude

no the cars shouldrun just fine at higher altitudes with the slightly lower octane rating. i just wanted to make sure cuz i dont wanna be stuck in a part of thecountry with shit gas. i saw a vr4 up there hauling ass, his car seemed fine, lol. and another stealth parked.
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Altitude affects forced induction cars very little to nothing at all. Thats proven.

Hell, Matt Monet at Dynamic Racing runs 8's at 5000 feet.

quackmandude · 07-22-2009, 01:26 PM

so is that canfirming my statement? lol
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jason_bet · 07-22-2009, 01:59 PM

Quote:

Originally Posted by Stealthee

Altitude affects forced induction cars very little to nothing at all. Thats proven.

Hell, Matt Monet at Dynamic Racing runs 8's at 5000 feet.

Where or how is this proven? Cause I know for a fact that if I run at my track here in Utah (4200ft) then drive down to Vegas and run there is almost a full second difference. take in to account that they prep better in vegas then here but not 1 second better prep...

Also the car won't have issues with changing altitude thats what you have a barometric sensor for

Jason

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